PK

<?php
ob_start();

header('Content-Type: application/json');
error_reporting(E_ALL);
ini_set('display_errors', 0);
ini_set('log_errors', 1);
//ini_set('error_log', 'quiz_errors.log');

if (session_status() === PHP_SESSION_NONE) {
    session_start();
}

// Validate session
if (!isset($_SESSION['userId'])) {
    echo json_encode(['success' => false, 'message' => 'User not logged in']);
    exit;
}

// Get and validate input
$input = json_decode(file_get_contents('php://input'), true);
if (json_last_error() !== JSON_ERROR_NONE) {
    echo json_encode(['success' => false, 'message' => 'Invalid JSON input']);
    exit;
}

$questionId = $input['question_id'] ?? null;
$userAnswer = isset($input['user_answer']) ? trim($input['user_answer']) : null;

if (!$questionId || $userAnswer === null || $userAnswer === '') {
    echo json_encode(['success' => false, 'message' => 'Invalid input data']);
    exit;
}

try {
    // Create PDO connection
    $dsn = 'mysql:host=localhost;dbname=questend_techconjiffyfilms;charset=utf8';
    $db = new PDO($dsn, 'questend_Usrjiffyfilms', 'hZy_VO*$VoWVFi+=;3M?FWazvx,=le=U');
    $db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    
    // Get question data
    $query = "SELECT qid, question, ans1, ans2, ans3, ans4, correct_answer 
              FROM quiz_questions 
              WHERE qid = ?";
    $stmt = $db->prepare($query);
    $stmt->execute([$questionId]);
    $question = $stmt->fetch(PDO::FETCH_ASSOC);
    
    if (!$question) {
        throw new Exception("Question not found in database");
    }

    // Normalize user answer (accept both 'A' or full answer text)
    $userAnswerLetter = null;
    $normalizedUserAnswer = strtoupper(trim($userAnswer));
    
    // Check if user provided a letter (A-D)
    if (in_array($normalizedUserAnswer, ['A','B','C','D'])) {
        $userAnswerLetter = $normalizedUserAnswer;
    }
    // Otherwise check if answer text matches any option
    else {
        $answerOptions = [
            'A' => trim($question['ans1']),
            'B' => trim($question['ans2']),
            'C' => trim($question['ans3']),
            'D' => trim($question['ans4'])
        ];
        
        foreach ($answerOptions as $letter => $text) {
            if (strcasecmp(trim($userAnswer), $text) === 0) {
                $userAnswerLetter = $letter;
                break;
            }
        }
    }

    // Validate answer format
    if (!$userAnswerLetter) {
        throw new Exception("Invalid answer format");
    }

    // Compare with correct answer (which is stored as A-D)
    $isCorrect = ($userAnswerLetter === trim($question['correct_answer']));

    // Save the answer attempt
    $insertQuery = "INSERT INTO quiz_answers 
                   (user_id, question_id, user_answer, answer, is_correct) 
                   VALUES (?, ?, ?, ?, ?)";
    $stmt = $db->prepare($insertQuery);
    $stmt->execute([
        $_SESSION['userId'],
        $questionId,
        $userAnswer,
        $question['correct_answer'],
        $isCorrect ? 1 : 0
    ]);

    // Update user points if correct
    if ($isCorrect) {
        $updateQuery = "UPDATE users SET points = points + 2 WHERE id = ?";
        $stmt = $db->prepare($updateQuery);
        $stmt->execute([$_SESSION['userId']]);
    }

    // Prepare response
    $response = [
        'success' => true,
        'is_correct' => $isCorrect,
        'correct_answer' => $question['correct_answer'], // Returns 'A','B','C', or 'D'
        'correct_answer_text' => $question['ans'.ord($question['correct_answer']) - 64], // Returns full text
        'user_answer' => $userAnswer,
        'user_answer_letter' => $userAnswerLetter
    ];

} catch (PDOException $e) {
    error_log("Database Error: " . $e->getMessage());
    $response = [
        'success' => false,
        'message' => 'Database error occurred',
        'error' => $e->getMessage()
    ];
} catch (Exception $e) {
    error_log("General Error: " . $e->getMessage());
    $response = [
        'success' => false,
        'message' => 'Error processing your answer',
        'error' => $e->getMessage()
    ];
}

ob_end_clean();
echo json_encode($response);
exit;

PK 99